Peds Math Help

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ive been working on this problem for a while now and i'm so confused how did they come up with the 2.091?

here is the problem:

the physician orders a child to receive lr iv at 2 times fluid maintenance for 6 hours. the child weighs 48.6 lbs (22.091 kg) how many drops per minute will you infuse the iv fluids (tubing gtt factor 15 drops/ml)

10 x 100 = 1000

10 x 50 = 500

2.091 x 20 = 41.82

1541.82

1541.82 divided by 24 = 64.2425 or 64.243 ml/hr for maintenance

64.243 x 2 = 128.486 or 128.49 ml/hr for 2 times maintenance

128.49 x 15 = 32.1225 or 32.12 answer: 32 or 33 drops per minute

60

tlc2u

226 Posts

see this link to a post by (chare) where fluid maintenance for children is discussed. if the link doesn't work i cut the info needed and pasted it just below the link.

https://allnurses.com/nursing-student-assistance/pediatric-fluid-maintenance-314809.html

fluids in older children

the maintenance fluid requirements of older children are also based on ml/kg/day.

1-10 kg: 100 ml/kg/d

11-20 kg: 1000 ml + 50 ml/kg above 10 kg/d

21-30 kg: 1500 ml + 20 ml/kg above 20 kg/d

> 30 kg: 1700 ml + 10 ml/kg above 30 kg/d

your question intriqued me as i have not encountered "pediatric fluid maintenance" equations yet. i looked in my nursing pharmacology math book and could not find these types of problems so i did a google search which brought me to another post on allnurses and the info i posted above.

are you using the above information for your math calcuation? i don't see it referenced in your posted problem but i do see where the 2.091 was obtained by using the factors above.

hope this helps.

Daytonite, BSN, RN

4 Articles; 14,603 Posts

Specializes in med/surg, telemetry, IV therapy, mgmt. Has 40 years experience.

48.6 pounds divided by 2.2, the conversion factor to change pounds to kilograms, = 22.0909090, which rounds off to 22.091

SN09

28 Posts

Thanx for you help.

tlc2u

226 Posts

the physician orders a child to receive lr iv at 2 times fluid maintenance for 6 hours. the child weighs 48.6 lbs (22.091 kg) how many drops per minute will you infuse the iv fluids (tubing gtt factor 15 drops/ml)

10 x 100 = 1000

10 x 50 = 500

2.091 x 20 = 41.82

1541.82

1541.82 divided by 24 = 64.2425 or 64.243 ml/hr for maintenance

64.243 x 2 = 128.486 or 128.49 ml/hr for 2 times maintenance

128.49 x 15 = 32.1225 or 32.12 answer: 32 or 33 drops per minute

60

_________________________________________________________________

fluids in older children

the maintenance fluid requirements of older children are also based on ml/kg/day.

1-10 kg: 100 ml/kg/d

11-20 kg: 1000 ml + 50 ml/kg above 10 kg/d

21-30 kg: 1500 ml + 20 ml/kg above 20 kg/d

> 30 kg: 1700 ml + 10 ml/kg above 30 kg/d

____________________________________________________________________________

sn09 i see you posted a thank you so i am guessing you figured out the problem. is this how it goes?

fluid maintenance is 1500 ml plus 20 ml/kg above 20 kg/d.

the child weighs 22.091 kg.

so 2.091 kg (is the amount the child weighs over and above 20kg)

so multiply 2.091 x 20 ml/kg = 41.82 +1500ml = 1541.82 ml/d of fluid maintenance.

gtt = 15 gtt.. x.. 1541.82 ml x 2 ..x.. 1 d ..x.. 1 hr ..=.. 46254.6 = 32.12125 = 32gtt/min

min.......ml..............1 d.................. 24 hrs ...60 min .....1440

is this how it goes or is there an easier way to figure this?

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